<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>引入方式</title>
    <style>
        .cls{
            color: yellow;
            background: red ;
            font-family: 微软雅黑;
            font-size: 40px;
        }

    </style>
    <link rel="stylesheet" href="../css/01.css">
</head>
<body>
<!--内联样式-->
<h1 style="color: green;background: #0a48ff";border :1px solid black; >天天向上</h1>
<!--内部样式-->
<div class="cls">人无远虑,</div>

<!--外部样式-->
<div id="d">必有近忧。</div>
</body>
</html>